Ethylene polymerization catalyst and catalyst system
US6323148A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Nov 17, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/0018
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An ethylene polymerization catalyst and catalyst system which provides an ethylene copolymer which is characterized by desirable ER shift values. The high level ER shift of these polymers produce films having high impact strength. The catalyst is prepared by treating a support material with an agent selected from the group consisting of a compound having the structural formula BX.sup.5.sub.3, where X.sup.5 is fluorine, chlorine, bromine, iodine or OR.sup.5, where R.sup.5 is C.sub.1 -C.sub.6 alkyl; a compound having the structural formula X.sup.6.sub.2 where X.sup.6 is fluorine, bromine or iodine; a compound having the structural formula NR.sup.6, where R.sup.6 is C.sub.1 -C.sub.6 alkyl or OR.sup.7, where R.sup.7 is C.sub.1 -C.sub.8 alkyl; and a compound having the structural formula Ti(OR.sup.8).sub.4, where R.sup.8 is C.sub.1 -C.sub.6 alkyl or phenyl to reduced surface hydroxyl group concentration of the support material. The thus treated support material is thereupon contacted with a dialkylmagnesium compound or complex, an alcohol compound or a silane compound and a transition metal compound, in that order. Alternatively, the sequence of contact of the transition metal compound …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.